Method of doubling up the purchase of hoist-ropes



(No Model.)

A. E. BROWN. METHOD OF DOUBLING UP THE PURCHASE OF HOIST ROPES.

No. 466,090. Patented Dec. '29, 1891.

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ATTORNEY" m: NORRLI versus 4:0,, PHOTO-1510., vmsummun, n4 0.

NITED STATES PATENT OFFICE.

ALEXANDER E. BROXVN, OF CLEVELAND, OHIO.

METHOD OF DOUBLING UP THE PURCHASE OF HO IST-ROPES.

SPECIFICATION forming part of Letters Patent No. 466,090, dated December29, 1891.

Application filed July 16, 1891. Serial No.399,739. (No model.)

To all whom it may concern:

Be it known that I, ALEXANDER E. BROWN, of Cleveland, in the county ofOuyahoga and State of Ohio, have invented anew and useful Method orSystem of Doubling Up or Increasing the Purchase of the Hoist-Rope of aHoisting and Conveying Machine; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, forming part of thisspecification.

My invention relates to a novel method of varying or multiplying anddiminishing the purchase or lifting capacity of the hoist-rope of thevarious species of that genus of hoisting and conveying machine in whichtheload is raised andlowered through'the medium of a hoist-block thesheave of which is hung in a depending loop of the hoist-rope, and whichhoist-block (with its attached load)-is raised and lowered by taking upand letting out the loop of said rope, all in amanner well known tothose familiar with the constructions and operations of hoisting andconveying inachines.

In the kind of machinery referred to it is very desirable, of course, inthe construction of the apparatus or plant for a given kind of work, tomake the hoist-rope, engine, and other parts only sufficiently heavy andstrong to certainly withstand allthe strain and wear to which they willnaturally be subjected in the performance of the kind of work for whichthe machine is mainly designed. It, however, sometimes happens that itwould be very convenient and desirable to use the machine for thelifting and transportation of a load greater than that to the handlingof which the machine is adapted, and to provide a way to render itcapable of doing this, and doing it without'risk of any undueorinjurious strain on any of the parts of the whole plant, is the objectof my invention, which to this end consists in a novel method ofincreasing the purchase of the hoist-rope (without bringing any morestrain on the hoist-en gine and other parts designed to lift only thelighter load) by doubling on itself the loop from which the load issuspended and multi= plying the strands thereof to work on supplementaldevices, with which the machine is supplied, all as will be hereinaftermore fully explained, and as will be more particularly pointed out inthe claim of this specification. To enable those skilled in the art toreadily understand and practice my novel method or system of varying thepurchase of the hoistropein that kind of machine referred to, I will nowproceed to more fully explain the same, referring by letters to theaccompanying drawings, which form part of this specication, and in whichI have illustrated my said novel method carried into efiect by the meansor appliances such as I have so far used in practicing my invention. Thedevices or apparatus by which I carry into efiect my novel method may,however, be diiferent from anything I have shown in this case, and mayproperly and do constitute the subject-matter of separate applicationsfor Letters Patent by me, which applications were. filed simultaneouslywith this case and are numbered, respectively, 399,7 37 and 399,7 38.

r In the drawings, Figure l is a side view of so much of an elevatedtramway hoisting and conveying machine as is necessary to be shown inorder to illustrate my invention. Fig. 2 is a perspective view, on aslightly enlarged scale, of a supplemental sheave-block,suoh as may beadded to and detached from the parts seen at Fig. 1 to respectivelyincrease and diminish the purchase or lifting capacity of thehoist-rope. Fig. 3 is a diagrammatical view showing the manner ofdoubling up the rope and its usually attached hoist-block; and Fig. 85 4is another diagrammatical view showing a further step in therope-doubling operation, and also showing the introduced supplementalhoist-block; illustrated as detached at Fig; 2. Fig. 5 is anotherdiagrammatical view showing another form of apparatus or another set ofdevices, used differently, for doubling up the loop of the hoist-rope toincrease the purchase three to one or for getting a greatermultiplication of the lifting power than that illustrated at Figs. 3 andat.

In all the figures the same part will be found designated by the sameletter of reference.

A represents part of the bridge-tramway, B the trolley, and C thehoist-rope of a Brown hoisting and conveying machine of that species inwhich the hoist-rope has one end anchored to a fixed point of attachmentD, and has the other wound on the drum of a hoist-engine (not shown) ina well-known manner.

Referring now to all the figures, except Fig. 5, the trolley B isprovided, as usual, with the type of machine shown, with suitableloadsustaining hooks c, with which are engaged, and from which aredisengaged, as occasion requires, the laterally-projecting trunnions mof the hoist-block F, all in a manner well understood by those familiarwith the construction and operation of hoisting and 0011- veyingmachines. The said hoist-block F is shown at Fig. 1 suspended in thesingle loop lot the hoist-rope as if in the act of either ascending ordescending, and is provided with the usual load-supporting hook g, fromwhich may depend the dump-bucket or other load-carrying device of themachine.

G is a supplemental hoist-block to be used only when it may be desiredto double up or multiply the lifting power of the hoist-rope O, and, aswill be seen best by reference to Fig. 2, this hoist-block G has tworope wheels or sheaves instead of one only, as in thecase of the usualhoist-block F.

The supplemental duplex hoist-block G is of course provided with adepending hook?) or equivalent device for engagement with the 1 handleof the dump-bucket or other load-receptacle with which the hoisting andconveying machine may be provided.

In the manipulation or adjustment of the mechanism or contrivance fromone to the other 'of its two different conditions the following modusoperandi should be followed:

Supposing the machine to be set or arranged for 'use in the usualcondition, and as illustrated correctly by Fig. 1, to double up ormultiply the power of the machine (with a proportionate loss of speed ofcourse in the movement of the load to be lifted) the loop Z of the ropeO is crossed, as seen at Fig. 3, by giving the hoist-block F a half turn.or revolution' in a horizontal plane, then the thus crossed loop Z isdoubled on itself (at a fold-line about coincident with the point m, atwhich the strands of the loop cross each other) by lifting the block Fup and giving it a halfturn sidewise, so as to bring it into about theposition indicated in dotted lines of Fig. 3, with its load-hook guppermost, as shown, and in this position (or after slightly lifting itwhile in this position) said hoist-block is brought into engagement withthe trunnionsupporting hooks e of the trolley. Then the double loop ofrope C, depending from the thus suspended block F, is pulled ordistended downwardly into a condition (about such as seen at Fig. 4) topermit the convenient insertion within the lower portion of such doubleloop of the supplemental block G, which is now inserted in such manner,as shown at Fig. at, as to have the two sheaves or rope-wheels 1 and 2of said block run in peripheral engagement with the two strands of thesaid double loop, as clearly indicated in the drawings. hen thusadjusted, with this duplex supplemental block G in place, as shown atFig. 4, the hoist-rope G will run, it will be seen, from the point ofanchorage at D along to and partially over one of the other rope-wheelsof the trolley, thence down to and partially around one of the twosheaves of the block G, thence up and over the singlesheave block F,thence down and partially aroundthe other one of the two sheaves ofblock G, and thence up and partially around the other rope-wheel of thetrolley, from which it passes onward toward the winding-drum of thehoist-engine.

By reference to the arrows at Fig. 4: the course of the hoist-rope justexplained may be easily followed visually, and from an observation ofwhat is there shown it will be understood that by the rearrangement ofthe strands of the rope O as there shown andthe introduction of theduplex sheave-block G the purchase or lifting capacity of the hoistropewill have been multiplied so as to become four to one, and that henceany load suspended from the load-hook dot the block G, while it will belifted more slowly by the winding up on the hoist-drum of the rope C,will be lifted with less power.

In applying the supplemental block G.(see

the lower side portions of the two plates I I of the block, and also thebolts to w, which secure in place the handles 13 1), (that are used torender the handlingof the block moneconvenient,) have of course to beremoved to get the strands of the double loop of the rope seated orplaced properly round about the lower portions of the groovedperipheries of the rope-wheels of said block, and said bolts or pins arereplaced after the block shall have been put in place in the rope-loops,as-seen at Fig. at.

Referring now to Fig. 5 only, the trolley is provided with twosupplemental sheavewheels marked, respectively, T and S, and the usualhoist-block F suspended in the loop of the rope C, is provided withthree sheaves or rope-wheels 1 2 3, instead .of having only one, as inthe case of the h0is.tb1ock F seen at Fig. l.

lVhen the machine or apparatus is to be used to .do the lighter work,(for which it is mainly designed and for which it is supposed to beemployed most of the time,) the two sup pleinental wheels S and T of thetrolley are left wholly in disuse, as are also the two outer rope-wheels1 and 3 of the hoist-block Fiend the machine works in the usual mannerwith a single loop of the hoist rope, in which is hung the hoist-blockF, with the middle ropewheel 2 of its series of sheaves in engagementwith said loop. \Vhen, however, it may be desired to increase thepurchase of the hoist rope six to one, the hoist-block F is removed, theloop of the hoist-rope pulled down and doubled up 011 itself to formthree loops, and these loops passed at their upper portions around thesupplemental trolley-wheels S and.

T, and at their lower portions around the-other rope -wheels 1 and 3 ofthe triplex set of sheaves of the hoist-block F all in such manner, asplainly illustrated at Fig. 5, (observe the arrow-heads at said figure,)that the pulling power exerted on the hoist-rope by the engine will bemultiplied in the proportion of three to one without any extra strain onthe rope, the anchorage, or the engine.

In the modification of the apparatus as shown at Fig. 5 the'same methodor system of increasing the purchase of the hoist-rope is effectuated asin the case of the mechanical appliances shown in the other form ofmechanism for only increasing the purchase four to one. Hence it willbeunderstood that, though various means or mechanical devices may beemployed in carrying out my novel method, the latter is not changed(except in the degree in which the purchase of the rope may be varied)by using more or less doubles of the loops on itself or employing suchvarious appliances or supplemental devices on the machine, as may benecessary to the different multiplications of the power of thehoist-rope on the particular hoist-block that may be used.

I therefore wish it to be distinctlyunderstood that my present inventionis not restricted to any degree of multiplication of or reduction in thelifting power of the hoist-rope and is in- 0 dependent of any particularset of devices for carrying it into effect; and that What I claim,broadly, and desire to secure by Letters Patent, is-

The hereinbefore-described method or sys- 3 5 tern of varying thepurchase or lifting capacity of the hoist-rope of that type of machinereferred to, which method consists in changing the number of loops ofthe hoist-rope at the vicinity of the hoist-block by doubling on 40itself the loop from which the load is suspended and multiplying thestrands thereof to work on supplemental devices with which the machineis supplied without unreeving the hoist-rope, substantially ashereinbefore 45 set forth.

In witness whereof I have hereunto set my hand this 18th day of June,1891.

ALEX. E. BROWN.

In presence of'- II. N. CHAMBERLAIN, M. MILLARD.

